杭州汽轮机厂计算机集成制造系统——HTW-CIMS

本文介绍了杭州汽轮机厂计算机集成制造系统HTW-CIMS的总体方案以及开发和应用该系统时遵循的技术路线。     

Estimation of Benchmark Dose of Lifetime Cadmium Intake for Adverse Renal Effects Using Hybrid Approach in Inhabitants of an Environmentally Exposed River Basin in Japan

The aim of this study is to estimate the reference level of lifetime cadmium intake (LCd) as the benchmark doses (BMDs) and their 95% lower confidence limits (BMDLs) for various renal effects by applying a hybrid approach. The participants comprised 3,013 (1,362 men and 1,651 women) and 278 (129 men and 149 women) inhabitants of the Cd‐polluted and nonpolluted areas, respectively, in the environmentally exposed Kakehashi River basin. Glucose, protein, aminonitrogen, metallothionein, and β₂‐microglobulin in urine were measured as indicators of renal dysfunction. The BMD and BMDL that corresponded to an additional risk of 5% were calculated with background risk at zero exposure set at 5%. The obtained BMDLs of LCd were 3.7 g (glucose), 3.2 g (protein), 3.7 g (aminonitrogen), 1.7 g (metallothionein), and 1.8 g (β₂‐microglobulin) in men and 2.9 g (glucose), 2.5 g (protein), 2.0 g (aminonitrogen), 1.6 g (metallothionein), and 1.3 g (β₂‐microglobulin) in women. The lowest BMDL was 1.7 g (metallothionein) and 1.3 g (β₂‐microglobulin) in men and women, respectively. The lowest BMDL of LCd (1.3 g) was somewhat lower than the representative threshold LCd (2.0 g) calculated in the previous studies. The obtained BMDLs may contribute to further discussion on the health risk assessment of cadmium exposure.     

Cumulants of random sum distributions

Consider a random variable S being the sum of a number N of independent and identically distributed random variables X_j (j = 1, 2, ...) where the number N is itself a non-negative integer-valued random variable independent of the X_j An explicit expression of the r-th cumulant of S is given in terms of the cumulants of N and X_j, Asymptotic properties of the distribution of S are also discussed.     

Exploring the Myth of Unhappiness in Former Communist Countries: The Roles of the Sex Gap in Life Expectancy and the Marital Status Composition

National average happiness and the difference in happiness between women and men are positively correlated in European countries. This study focuses on this cross-country relationship and tests (1) whether, after controlling for socio-economic factors, the correlation is attributed to their direct relationship, or, alternatively, explained by the sex difference in life expectancy, and (2) whether the correlation is not only exogenously explained but also endogenously generated by the sex difference in life expectancy. Performing regression analyses, this study shows that the correlation between happiness and its sex difference is spurious, and that the sex difference in life expectancy generates this correlation and accounts for about one-third of the correlation. A decline in happiness influences men’s mortality more than women’s, and widens the life expectancy gap between women and men. This in turn raises the widowhood ratio among women, lowers women’s average happiness, and reduces the happiness gap between women and men. The results obtained in this study points to the importance of controlling for the demographic composition of the population when we use aggregate happiness measures as national happiness indicators.     

海德格尔论学术出版——"曾经在场的启示"读后感

海德格尔的＂曾经在场的启示＂一文用哲学的言语诠释了学术出版的核心价值和道德要求。他指出：学术出版者要聚集一批具有学术精神的学者;出版者应具有敏锐的出版艺术和坚定的出版策略;学术出版只有担当起历史的责任,才能经受住历史的考验,体现出学术的价值。     

计算机集成制造与成组技术

成组技术(GT)和计算机集成制造(CIM)是两种改变传统的机械制违中多品种、小批量制造企业落后面貌的先进技术和方法。本文探讨了这两种技术之间的关系,着重说明以下问题:GT通过对系统的简化而成为CIM的基础;以CIM思想为指导开发GT系统,不仅可取得较好的近期效益,而且随着企业计算机应用水平的提高,可在GT系统的基础上建立起CIM系统。本文最后对一个实际工厂目前正在实施的GT系统和正在规划的CIM系统的关系作了探讨。     

DELAY ESTIMATION BY A HILBERT TRANSFORM METHOD

This paper describes an estimation of the time delay between two stationary time series signals, in which an input signal is measured with little noise and an output signal is the sum of a noise and the response from a linear system. We use the Hilbert transform relation for minimum delay systems to estimate the time delay. Some computer simulation results are given to evaluate the performance of the proposed method.     

Recurrence formula on the joint distribution of sample skewness and kurtosis under normality

Abstract

Two recurrence relations with respect to sample size are given concerning the joint distribution of skewness and kurtosis of random observations from a normal population: one between the probability density functions and the other between the product moments. As a consequence, the latter yields a recurrence formula for the moments of sample kurtosis. The exact moments of Jarque-Bera statistic is also given.     

日本对外经济政策的演变(上)——从日美产业结构调整磋商到东亚共同体构想的提出

20世纪90年代,日本对外经济政策经历了两个方面的模式转变:第一,在贸易摩擦的应对和处理方面,摆脱了以往重视双边磋商和达成妥协的作法,转向通过多边框架以法律途径解决争端的轨道;第二,在贸易与投资自由化的促进方面,从多边主义转向了区域主义和双边主义。本文主要探讨导致这一模式转变的原因、模式转变过程中的促进势力和抵制势力以及抵制势力被克服的政策形成过程、两个模式之间的矛盾与冲突以及模式转变的稳定性等问题,在此基础上分析和展望日本今后的对外经济政策走向。     

产学研合作研究生培养模式研究

针对目前研究生教育存在的培养资金不足、培养模式单一等问题,山西省有关部门提出了由企业技术中心的高级技术人员参与高校研究生培养模式。通过运用问卷调查、数理统计等研究方法,证明该模式是推动创新型研究生培养的较好方法。